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If the concerned people knew all about MySQL they wouldn't need you right?
What would they do in Access if the board ran on it anyway? The board does all the SQL and they don't have to see the backend no matter what it runs. I won't argue MySQL vs Access, X runs on MySQL.
If they want to feel all GUI nice with Access than install MyODBC and from Access you can see MySQL via linked tables. But you definetly don't want anyone with more than read-only, let XoopS do the SQL unless they really know what they are doing.